<template>
  <view>
    <view class="search-box">
       <uni-search-bar cancelButton="none"  @input="input" ></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
   <view class="sugg-list" v-if="searchResults.length !== 0">
     <view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
       <view class="goods-name">
         {{item.goods_name}}
       </view>
       <uni-icons type="arrowright" size="16"></uni-icons>
     </view>
   </view>
   <!-- 搜索历史 -->
   <view class="history-box" v-else>
     <!-- 标题区域 -->
     <view class="history-title">
       <text>搜索历史</text>
       <uni-icons @click="clean" type="trash" size="17"></uni-icons>
     </view>
     <!-- 列表区域 -->
     <view class="history-list">
       <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
     </view>
   </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer:null,
        kw:'',
        searchResults:[], // 搜索的结果
        historyList:[] // 搜索历史的数组
      };
    },
    computed:{
      histories(){
        return [...this.historyList].reverse()
      }
    },
    onLoad(){
     this.historyList= JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods:{
      // input输入事件的处理函数
      input(e){
        clearTimeout(this.timer)
        this.timer= setTimeout(()=>{
          this.kw=e.value
          this.getSearchList()
        },500)
      },
      async getSearchList(){
        // 判断搜索关键词是否为空
        if(this.kw.length===0){
          this.searchResults=[]
          return
        }
       const {data:res}= await uni.$http.get('/goods/qsearch',{query:this.kw})
       this.searchResults=res.message
       this.saveSearchHistory()
      },
      gotoDetail(item){
        uni.navigateTo({
          url:'../goods_detail/goods_detail?goods_id='+item.goods_id
        })
      },
      // 保存搜索关键词
      saveSearchHistory(){
        // this.historyList.push(this.kw)
        const set=new Set(this.historyList)
        set.delete(this.kw)
        set.add(this.kw)
        this.historyList=Array.from(set)
        // 对搜索历史数组进行持久化
        uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      // 清空搜索历史
      clean(){
        this.historyList=[] //将搜索历史数组清空
        uni.setStorageSync('kw',[]) // 将本地存储清空
      },
      gotoGoodsList(kw){
        uni.navigateTo({
          url:'../goods_list/goods_list?query='+kw
        })
      }
    }
  }
</script>

<style lang="scss">
.search-box{
  position:sticky;
  top: 0;
  z-index: 999;
}
.sugg-list{
  padding: 0 5px;
  .sugg-item{
    display: flex;
    align-items: center;
    justify-content:space-between;
    font-size: 12px;
    padding: 13px 0;
    border-bottom: 1px solid #efefef;
    .goods-name{
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
  }
}
.history-box{
  padding: 0 5px;
  .history-title{
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: 1px solid #efefef;
  }
  .history-list{
    display: flex;
    flex-wrap: wrap;
    .uni-tag{
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
